[turbofan] Collect invocation counts and compute relative call frequencies.

src/compiler/ast-graph-builder.cc

Index: src/compiler/ast-graph-builder.cc
diff --git a/src/compiler/ast-graph-builder.cc b/src/compiler/ast-graph-builder.cc
index fda3c7ad44cb90803a44c5faf3ef55711ec3316f..56b1f8c2d2852ebdf23f268784bc650091b2a7e7 100644
--- a/src/compiler/ast-graph-builder.cc
+++ b/src/compiler/ast-graph-builder.cc
@@ -411,14 +411,15 @@ class AstGraphBuilder::ControlScopeForFinally : public ControlScope {
   TryFinallyBuilder* control_;
 };
 
-
 AstGraphBuilder::AstGraphBuilder(Zone* local_zone, CompilationInfo* info,
-                                 JSGraph* jsgraph, LoopAssignmentAnalysis* loop,
+                                 JSGraph* jsgraph, float invocation_frequency,
+                                 LoopAssignmentAnalysis* loop,
                                  TypeHintAnalysis* type_hint_analysis)
     : isolate_(info->isolate()),
       local_zone_(local_zone),
       info_(info),
       jsgraph_(jsgraph),
+      invocation_frequency_(invocation_frequency),
       environment_(nullptr),
       ast_context_(nullptr),
       globals_(0, local_zone),
@@ -3104,7 +3105,10 @@ float AstGraphBuilder::ComputeCallFrequency(FeedbackVectorSlot slot) const {
   Handle<TypeFeedbackVector> feedback_vector(
       info()->closure()->feedback_vector(), isolate());
   CallICNexus nexus(feedback_vector, slot);
-  return nexus.ExtractCallCount();
+  double const invocation_count = feedback_vector->invocation_count();
+  double const call_count = nexus.ExtractCallCount();
+  return static_cast<float>(call_count / invocation_count) *
+         invocation_frequency_;

[mvstanton, 2016/09/14 09:26:09]

How about giving the CallICNexus responsibility for this computation...it can
see the invocation_count() after all.

[Benedikt Meurer, 2016/09/14 10:55:44]

Done.

 }
 
 Node* AstGraphBuilder::ProcessArguments(const Operator* op, int arity) {